滚仰式导引头红外光学系统设计
发布时间：2018-10-30 12:53
【摘要】：滚仰式红外光学系统由物镜前组、折转镜组和成像后组组成,其平台内框架俯仰范围可达到±90°,外框架可以实现360°滚转,使光学系统观察视场覆盖整个前半球。光学系统实现了100%冷光阑效率。为适应较大的工作环境温度变化,对光学系统开展了被动无热化设计,给出了被动无热化实现的计算公式,并利用"虚拟色差"技术,快速确定了满足无热化条件的光学系统最优初始解。针对制冷型红外光学系统的"冷反射"效应,给出了冷反射诱导温差(NITD)的计算公式,并对敏感表面进行了优化控制。设计结果表明,光学系统焦距为58 mm,视场大小为4.0°,F数为2.0,在-50~60℃工作温度范围内系统MTF值接近衍射极限,并对"冷反射"效应具有较好的抑制能力。经样机测试,光学系统成像清晰稳定,性能良好,满足设计及使用要求。
[Abstract]:The rolling infrared optical system is composed of the objective lens front group, the refractive mirror group and the post-imaging group. The pitch range of the frame in the platform can reach 卤90 掳, and the outer frame can roll 360 掳, so that the optical system observation field of view covers the whole front hemisphere. The optical system achieves an efficiency of 100% cold aperture. In order to adapt to the large temperature change in the working environment, the passive non-thermal design of optical system is carried out, and the calculation formula of passive non-heating is given, and the "virtual color difference" technique is used. The optimal initial solution of the optical system satisfying the non-thermal condition is determined quickly. In view of the "cold reflection" effect of the refrigeration infrared optical system, the formula of the cold reflection-induced temperature difference (NITD) is given, and the optimal control of the sensitive surface is carried out. The design results show that the focal length of the optical system is 58 mm, the field of view is 4.0 掳and the F number is 2.0. The MTF value of the optical system is close to the diffraction limit in the working temperature range of -50 ~ 60 鈩，
本文编号：2300060
[Abstract]:The rolling infrared optical system is composed of the objective lens front group, the refractive mirror group and the post-imaging group. The pitch range of the frame in the platform can reach 卤90 掳, and the outer frame can roll 360 掳, so that the optical system observation field of view covers the whole front hemisphere. The optical system achieves an efficiency of 100% cold aperture. In order to adapt to the large temperature change in the working environment, the passive non-thermal design of optical system is carried out, and the calculation formula of passive non-heating is given, and the "virtual color difference" technique is used. The optimal initial solution of the optical system satisfying the non-thermal condition is determined quickly. In view of the "cold reflection" effect of the refrigeration infrared optical system, the formula of the cold reflection-induced temperature difference (NITD) is given, and the optimal control of the sensitive surface is carried out. The design results show that the focal length of the optical system is 58 mm, the field of view is 4.0 掳and the F number is 2.0. The MTF value of the optical system is close to the diffraction limit in the working temperature range of -50 ~ 60 鈩，
本文编号：2300060
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